Null response from server in Php - php

Question

I'm coding a web service for iOS in Php. I'm trying to retrieve data from server through php but the response is null.The server is MSSql Server 2014.
<?php
define ('DB_HOST', '****.net');
define ('DB_USER', '****');
define ('DB_PASS', '******');
define ('DB_NAME', '*******');
$dbc = mysql_connect(DB_HOST, DB_USER, DB_PASS);
mysql_select_db(DB_NAME, $dbc);
if (mysql_select_db){
echo "Done";
}else{
echo "Die";
}
$sql_select = "SELECT * from ClientChk";
$records = mysql_query($sql_select);
$count= 1;
while($result = mysql_fetch_array($records))
{
if ($result == nil){
echo "Nil!";
}
}
echo json_encode($result['Id']);
?>

Answer 1

This is a bad example of doing this.
1) You have to check if the connection was successful.
2) If use MSSQL, then you can't use mysql_ commands.
3) nill doesn't exist in php, should be 'null'

Answer 2

$SERVER = '127.0.0.1';
$DB = 'test';
$USER = 'username';
$PASSWORD = 'password';
$db = new PDO("sqlsrv:server=$SERVER;database=$DB;", $USER, $PASSWORD);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
try {
$query = "SELECT * FROM ClientChk";
$result = $db->query($query)->fetchAll(PDO::FETCH_ASSOC);
} catch (PDOException $ex) {
$ex->getMessage();
echo $ex;
}
echo json_encode($result);

Answer 3

So, the problem is, that you try to connect to a MSSQL database, with a MySQL database connector.
To connect to a MSSQL database, you can use the following methods:
mssql_connect(): It uses a quite similar syntax to mysql, but it is removed as of php 7.0, so I advice against it's usage even if you using an earlier version of php.
PDO class: It's differs a lot from the older function style sql connectors, but it is the preferred way by many.
sqlsvr_connect(), obdc_connect(): If you prefer a function based connector instead of the PDO class, and you don't want to use the deprecated mssql_connect, I recommend choosing one of these.
I hope, I could be of any help.